3640404 has 12 divisors (see below), whose sum is σ = 8494304. Its totient is φ = 1213464.

The previous prime is 3640391. The next prime is 3640409. The reversal of 3640404 is 4040463.

3640404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

3640404 is a modest number, since divided by 404 gives 364 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151672 + ... + 151695.

Almost surely, 2^3640404 is an apocalyptic number.

It is an amenable number.

3640404 is an abundant number, since it is smaller than the sum of its proper divisors (4853900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3640404 is a wasteful number, since it uses less digits than its factorization.

3640404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303374 (or 303372 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 3640404 is about 1907.9842766648. The cubic root of 3640404 is about 153.8331244607.

Adding to 3640404 its reverse (4040463), we get a palindrome (7680867).

The spelling of 3640404 in words is "three million, six hundred forty thousand, four hundred four".